Waves

Question 1

Wave

Answer 1

A traveling disturbance that propogates energy from one location to another

Material the wave travels through is a medium

Movement of energy is called propogation

Question 2

Transverse wave

Answer 2

Move perpendicular to the direction the energy is moving in

Question 3

Frequency

Answer 3

Number of waves per second (Hz)

Question 4

Longitudinal wave

Answer 4

Move in the same direction the energy is moving in

Question 5

Wave speed

Answer 5

Freequency x wavelength (m/s^-1)

Question 6

Types of sound

Answer 6

Inaudible and audible
Human hearing - 20-20,000Hz
Waves below 20Hz = Infrasonic waves
Waves above 20,000Hz = Ultrasonic waves
- Unpleasant and pleasant
- Soft, loud, noise, and music

Question 7

Infrasonic waves

Answer 7

Detect earthquakes, volcanic eruptions, study activity in human heart

Whales, giraffes, and elephants use them to communicate

Question 8

Ultrasonic waves

Answer 8

Used in sonograms and some lesser known applications of ultrasound

Bats use them to locate prey, and avoid obstacles

Question 9

Echo

Answer 9

• Echoes are sound waves reflected from a reflecting surface at a distance from the listener. Due to persistence of hearing, we keep hearing the sound for 1 /10th of a second, even after the sounding source has stopped vibrating.
• When a sound meets a hard surface, it reflects

Question 10

Sound intensity

Answer 10

The amount of energy that is transported past a given area of the medium per unit of time is known as the intensity of the sound wave. (dB)

Question 11

Electromagnetic Waves

Answer 11

• Do not require a medium to transfer energy.
• Considered transverse waves

Question 12

White sound

Answer 12

contains all frequencies across the spectrum of audible sound in equal measure